package tech.bmatch.meituan.util;

public class DistanceUtil {
    /**
     * 转化为弧度
     *
     * @param d
     * @return
     */
    private static double rad(double d){
        return d*Math.PI/180.0;
    }
    public static double getDistance (double lon1,double lat1,double lon2,double lat2){
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1-radLat2;
        double b = rad(lon1)-rad(lon2);
        double s = 2*Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2)+Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));
        s = s*6371000;
        s = Math.round(s * 10000)/10000;
        return s;
    }

    public static void main(String[] args) {
        double lon1 =120.026208;
        double lat1 =30.279212;
        double lon2 =120.011091;
        double lat2 =30.290126;
        double dist;
        dist = getDistance(lon1,lat1,lon2,lat2);
        System.out.println("两点相距："+dist+"米");
    }
}
